Bark beetles, Pseudohylesinus spp. (Coleoptera: Scolytidae), associated with amabilis fir defoliated by Neodiprion sp. (Hymenoptera: Diprionidae)

L. H. McMullen, R. L. Fiddick, R. O. Wood


Only <i>Abies amabilis</i> (Dougl.) Forbes heavily defoliated by a sawfly, <i>Neodiprion</i> sp., supported broods of <i>Pseudohylesinus </i>spp.. Although many trees with less defoliation showed evidence of attack, usually it was caused by adult beetles making overwintering niches. <i>P. granulatus</i> (Leconte) was found on the lower bole, whereas <i>P. grandis</i> Swaine and <i>P. nobilis</i> Swaine were found on the upper bole. Defoliated <i>Tsuga heterophylla</i> (Raf.) Sarg. were not attacked by bark beetles.


bark beetles; <i>Pseudohylesinus</i> spp.; Coleoptera; Scolytidae; amabilis fir; <i>Neodiprion</i> sp.; Hymenoptera; Diprionidae

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